All tools

OBJ to STL

Turn an OBJ into an STL for a 3D printer or slicer, in millimetres and standing on Z, each file read back before you get it. Free, with no account or uploads.

The shape is written in the unit you choose, standing on Z as slicers expect. STL holds no colours, so the OBJ's materials are left out.

Drop an OBJ to turn it into an STL

Or choose one. For an OBJ with its MTL and pictures, or a glTF with its .bin, choose them all at once.

  • GLB
  • STL
  • OBJ
  • FBX
  • STEP
  • 3MF
  • USDZ
  • IFC
  • 3DM
  • +22 more

Stays on your device. Nothing is uploaded.

How it works and help

A little help along the way

Follow these steps. Every option is explained underneath. Everything happens in your browser; the model is never sent anywhere.

  1. Open the modelDrop it on the page or press Choose a file. An OBJ shows its colours when its .mtl file and pictures are chosen with it; a .gltf needs its .bin and pictures too. Choose them all at once.
  2. Turn it roundDrag to turn it, scroll or pinch to zoom, and drag with the right mouse button or two fingers to move it. Fit brings the whole model back into view; Front, Top, Side and Corner look at it from those sides.
  3. Say its size, if it has noneSTL, OBJ and PLY files do not say what their numbers mean. The page reads STL files in millimetres, as 3D printers and CAD programs write them; if the size looks wrong, choose the unit the file was made in.
  4. Choose how fine curves are, for CAD filesSTEP, IGES and BREP files keep exact curves, which are cut into flat triangles to be drawn. Fine suits most parts; Very fine follows curves more closely and makes a larger model, Draft a quicker, coarser one.
  5. Measure itThe size of its box is shown at once, with its surface area, and its volume when it is a closed shape. Press Measure, then two points on the model, for the distance between them; a press near a corner snaps to it.
  6. Look insideCut slices through it across its height, width or depth. Parts lists every piece by name: hide one, or press it to see which it is.
  7. Save a picturePicture saves a PNG of the model as it is shown, at the size set under More options, on a clear background if you like.

Questions people ask

Will my OBJ's colours come through?
No. An STL holds triangles and nothing else, so colours, materials and pictures are left out; the page lists them before you download.
What size will the STL be?
The OBJ's numbers are kept unless you choose another unit under Write its sizes in. OBJ files say no unit, so check the size the viewer shows first.
Why is the STL turned on its side?
It is turned to stand on Z, as printers expect, from the Y that OBJ models usually stand on; it sits on the bed as it stood on the floor, never mirrored.

This page is the 3D viewer, opened for this one job; every other tool it has is one press away. Each of its settings is explained on the 3D viewer's own page.

Read the step-by-step guide

Guides

Same tool, other jobs

Tools nearby